the extramarital atary we're told was with a paula broadwell seen in this picture, traveling with david petraeus. she was actually a biographer. wrote a book about petraeus and revealed she was having this affair. he was having this affair with her in the course of an investigation. f.b.i. was investigating a broader case unrelated to their affair. in the course of the investigation, broadwell's name came up and the f.b.i. followed that and believed that possibly petraeus was some sort of victim of blackmail. could have been a security breach. there was no evidence of that and f.b.i. was involved from the beginning. the president accepted david petraeus' resignation and it to testify ins before benghazi hearings up on capitol hill. we're told he will not testify. he could be compelled to testify. let's bring in panel. steve hayes for "weekly standard." charles lane, opinion writer for ""washington post" post." syndicated columnist charles krauthammer. steve? >> well, this raises many, many questions. when did the f.b.i. first learn of the affair? when did the president and his advisors